Design principles for high sensitivity photoacoustic cells

Miklós Szakáll, Zoltán Bozóki, Imre Gáspár, János Csikós

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Abstract

Usually the photoacoustic signal level is low; therefore at signal detection it is very important to reject external noise effectively. The PA signal is generated in a chamber, which has openings for free gas-flow, however in ideal case it ought to be closed for achieving the highest possible level acoustical signal generation. In order to emulate closed gates, the measuring chamber requires high acoustical impedance at its openings. Well designed acoustical networks, consisting of tubes and cavities may ensure appropriate noise filtering and acoustically hard chamber termination at the same time. On the basis of electrical transmission line analogy cost-effective and easy to realize acoustical filter networks can be designed. These acoustical filters - in combination with low noise microphone amplifier and electronic filters in the signal processing chain - result in clear PA signal for gas analysis. In the paper the theory of acoustical transmission line filter design for PA applications and a software implementation will be presented.

Original languageEnglish
Title of host publicationForum Acusticum Budapest 2005
Subtitle of host publication4th European Congress on Acustics
Pages1437-1440
Number of pages4
Publication statusPublished - Dec 1 2005
Event4th European Congress on Acustics, Forum Acusticum 2005 - Budapest, Hungary
Duration: Aug 29 2005Sep 2 2005

Publication series

NameForum Acusticum Budapest 2005: 4th European Congress on Acustics

Other

Other4th European Congress on Acustics, Forum Acusticum 2005
CountryHungary
CityBudapest
Period8/29/059/2/05

ASJC Scopus subject areas

  • Acoustics and Ultrasonics

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    Szakáll, M., Bozóki, Z., Gáspár, I., & Csikós, J. (2005). Design principles for high sensitivity photoacoustic cells. In Forum Acusticum Budapest 2005: 4th European Congress on Acustics (pp. 1437-1440). (Forum Acusticum Budapest 2005: 4th European Congress on Acustics).